Automatic duplicating machine



Dec. 7, 1948.

R. D. SHAW AUTOMATIC DUPLICATING MACHINE 5 Sheets-Sheet l Filed Jan.v 28, 19441l HllllI IIII INVENTOR Rae/' ,572W WMM I I Ham/E1 Dec. 7, 1948. R. D. SHAW 'AUTOMATIC DUPLCATING MACHINE 5 Sheets-Sheet 2 IN VEN TOR Robe/'21D ,Shaw

ATTORNEY Del.7,194s. "R. D; SHAW l 2,455,882

AUTQMATIG DUPLICAMNG MACHINE Filed Jan. 28, 1944 s Smets-sheet s IN V EN TOR.

ATORNEY Patented Dec. 7, 1948 UNIfT-Eo stares PATENT ortica UTQMETIG' DUPLIC-TING;

5 Robert 1),. Shaw, Bloomfield., Connaassignor to Niles-Bementrlond. Company, West' Hartford;

Conn., a corporation oNetv Jersey Applicatonlnmmrg 28, 1944;,i Seria/L Nn,..520020 a: claim-, (ci. aol-say fvIhis invention relatestoduplicatingl machines.`

and, particularly to.- a fullo(Y automatic. traces com trolledl electrically operated prolingg` machine., the: machine being so designed that. a complete outline ot any' regular or irregularI shane may. bei reproduced by movements oft a, cutting. too1 the; path of movement of the toolv being controlli-:zds electrically.- by a tracer traversing aatemplate:cor--M responding in outline` to.- the. torm-4 loeing reeV produced Primarily the' invention relates. tof improved control circuits for; a. machine of 'the Kelleli tape designedI to completely cut any shape on out-- line Withoutmanual` adjustments of a spring; tension member now used for-urging the.tenir-llanto engaging end of a tracer toward successive por tions ot ther template as. the; cutting openation progresses A. primary' object of the. presentinvention is. to., provide. a template following` tracer opens and closes, contacts in the control circuits :forv4 Work positioning members of the machina, these. contacts being opened and closed` by engage-v ment ot one. end of the tracer with a. template mounted adjacent the tracer.

V,Another object, of the invention is to provide. a. plurality of contacts circularly arranged; for. controllingl movements ot the tracer and of. the.. cutter moved thereby, these contacts beine closedA successively as the tracer traversesdierent pom tions, ot the: template being reproduced.` n

Another objectoi the yinvention is to provider a contact shifting mechanism for a contact carrying memberV associatedwith the tracer, these contacts being engaged bv an opened and closed by movements ot the; tracer lever aS: the, tracer movesinto and out of contact with the template, the membery being;` shifted slightly` so.r that errors caused by the; gaps,- respectiveli? be tween, the contacts; on this member and those: on` the tracer lever may be elimina-tem,

And finally it is an object to: control this corbtact shifting member electricallyy bv means. of.'

contactsy opened and closed bv a rotatable radial, arm rotated in timed rel-ation` with movements; of the tracer about the template.

Primarily the; invention is; adapted to produce more efficiently a result similar to that ae complished by they tracer mechanism shown anda described in my Patent LQSGAISQ.,vv grantedpxil 2, 1935Jv by means of electrical, control. eirciitts,1 these improved. circuits being used to control magnetic clutchesy through control circuitssimf-- lar; to. those shown and described in patent, to .1, C2. Shaw 1,633,581, granted September 4, 1928,.

y 2. when effecting, profile operations and when provided with, the. form` of ttacer shown in Fig-1 16 ofthe drawings for Patent 1.681%,581

With. the. above and, other objects in view the invention consists inthel features of construction and; operation.. set. forth in the following specification and, illustrated iny the accompanying drawings,

In. the, accompanying, drawings annexed hereto andi, forming` a. part oi this speciiication, I have shown the invention embodied' in al tracer contlolled machine of the Keller automatic. prol'ng, typo but ity Will be understood that the invcntiongoan. be otherwise embodied and that the drawings are not to, be construed as dening or limiting, the. scope ofothe invention,A the claims apnended to this. specication being relied upon tor that purpose.

Inthe. drawings;

Eigure I is a slide elevation, partly in section,A showing a complete tracer provided with the present invention.

Fig;` 2 lsman end View showing the contact operating end of the tracer.

Eig. 3 is. a detail' view of the contact shifting means and' the electromagnet therefore.

Fig;t 4" a. Sectional View of the contact shiftingJ means taken on` the plane of line 1 4A of Fi'g. 3.1A

FigA a complete diagram of' the circuits employedin theV present control mechanism.

' Fig., 6 is.. a. diagrammatic. View showing an as sumedstarting position of the tracer relative to a circular template.

Fig. '7V is a form of. template that may be reproducedbythe present invention.

lig.. 8 is an outline olravvini;v in elevation of a machine, to. which the invention may be applied, and

Figi 9 is. a. diagram showing relative positionl olf. the. tracer and cntter tothe. template and work piece..

In the above mentioned drawings there has been. shown bnt. onel embodiment. of. the. invention which iis. now deemed. prcifnfable,A but, it. is, tobe understood that, changes, and modications may be, made within the. scope. oi the appended claims. without departing from.v the. spirit. ofv the inV ventina... l

Brieflp andfin its preterred, aspectA the. inven-l tion may include the tollen/.ins principal parts: atraco): actuated Contact operating lever.

movementsjo which are. effected bv onaagemem and disengagementl of the tracer spindle with thetemplate beine:- reproduced; second, a slide tending radially 'from said tracer and adapted to slidably engage a member outstanding from the template being reproduced; sixth, a rotatably mounted contact closing arm actuated by said radially extending arm; and seventh, groups of circuit controlling contacts for actuating work positioning members successively closedv andopened by said rotatably mounted arm.

Referring to Fig. 1 of the drawings, the tracer Il] is pivotally mounted for universal movementintermediate its length in a cylindrical support I I' gagement with the in contact 33 so that the machine will operate to advance the tracer IIJ toward the template Ill and the cutter 9 toward the work piece 8 shown in Fig. 8.

`The movement` ofthe tracer I0 about the periphery of the template Iand the movement of the cutter as shown in Fig. 8 are controlled 'by electromagnets N, S, E and W (Fig. 5) in which is rigidly supported in a hollow tube I2.

rlhe tracer It at its outer end carries a disc I3 which is adapted to follow the surface o'f a template ill having an outline being reproduced by a cutter not shown) controlled by the tracer. In the following description of the control circuits it is assumed that the periphery of the template I4 is circular. This is assumed for the purpose of' simplifying the description of the operation of the mechanism. It is to be understood, however, that any path or outline may be reproduced and that the outline may be an internal or external surface of the template;

Rotatably mounted at the tracer end of the hollow tube I2 is a plate I5 which carries on its inner face a gear It and has rigidly mounted on its .outer face a radius arm I1 in the outer face of which is a longitudinally extending slot i8 within which engages the end of a fixed pin I9 presently to be more fully dened. Engaging with the gear I6 is a second gear 20 mounted ona shaft 2i extending parallel to the tracer body I2 and carrying i on its inner end an arm 22 having a projecting stud which is adapted, as said arm is rotatedconsequent upon the movement of the tracer' disc I3 about the template I4, to successively engage a series of grouped contacts to successively close the contacts of each set or group as it engages them. The series of sets of contacts comprisesv in the present embodiment a series of four, namely, CI, C2, C3, C4, each set including four contacts a, b, c, and d, shown in Fig. 5, and a series of fourl intermediate contacts 23, 24, 25 and 26, each. of which sets includes two contacts. The sets of contacts are adjustably mounted upon a support 2l which is mounted in fixed relation on thesupports II and I2 for the tracer I0. y

As will be seen in Fig. 1 of the drawings, the pin i3 engaging the slot in the radius arm I'I is positioned approximately at the central portion of the template I4 so that as the discl3 traverses the' template I4 the radius arm I1 is forced to rotate and simultaneously rotate the gear I6 and the The tracer support II extends from a support 28 for a grounded pivotally mounted contact lever 2S of the usual kind used in Kellermachinesr having at its inner end a concave recess in which engages the rounded end of the tracer I0. The end of the lever 29 is normally pressed against the end of' the tracer I0 by an adjustable spring 3I.` The outer end of the lever 29 carries contacts 32l on opposite faces which are adapted to cooperate respectively with in andfout contacts 33 and shaft ZI together with its contact actuating arm 34. These in and out contacts* are mounted4 according to the present invention on "a trans'-` the usual manner, these magnets being energized 'respectively by the relays RN, RS, RE and RW. One pole of each of the magnets N 'andS is connected by wire 40 to the negative sidey of supply main M while one pole of each of the magnets E and W is connected by wire 4i to the negative side of the main M, Each of the armatures 42, 43, 44 and 45 of the relays RN, RS, RW and REis connected by wire 46 or a wire il to the positive side Iof the supply'main M. The other poles of the magnets N, S,W and E are respectively connected to the stationary contacts 125, 41, 48 and 49 of the relays RN,`RS, RE and RW, The energizing, therefore, of any one ofthe relays RN, RS, RW and RE closes its armature against its cooperating stationary contact and thereby causes the energization, respectively, of one of the electromagnets N,`S,Eor W.

' The control of the operation of said relays to effect the control of the movement of the tracer and 4of the cutter in conformity with each other is effected by push buttons I, 2, 3 and 4; relays RI, R2, R3 and R4; sets of contacts CI, C2, C3 and Ct; contacts 23, 24, 25 and 2S; and contact arm 29 of the'tra'cer.

The push buttons I, 2, 3 and Ll respectively control two sets of contacts Ia-Ib; 2a--2b; 3ft-3b; and 40e-4b. The relays RI, R2, R3 and R4 respectively control the engagement with four stationarycontacts ic-Id-Ie and If; 2c-2d-2e and 2f; 3c-3d-'3e and 3f and 40--4d-4e and 4f of four corresponding movable contacts IS- IN-IE and IX; 2W-2E-TS and 2X; 3N-3S- 3W and 3X and 41E-4W, 4N and 4X.

Operation of the control west of the template i4 as indicated in Fig. 6.'

Assume also that contact closing arm 22 is intermediate the set of contacts 23 and the set of contacts C l The tracer disc I3 must rst be brought into contact with the periphery of the template I4. This is effectedvby the momentary operation ofV press button l,"-which momentarily closes the contacts la and the contacts Ib. The closure of the contacts ib ei'ects the energizing of solenoid 5E) of the relay Ri by the closing of a circuit from ground, line 5I, line 52, contacts Ib, line 53, junction point 54, solenoid 50, junction point 55, line 56,-and`generator`5'i to ground. Energizing of solenoid 5d engagesy contacts lS, EN, IE and IX respectively with contacts Ic, Id, ie and If whereupon a holding circuit for the solenoid 50 is completedfrom,junction point 54, line 58, contact IJ,I contact iX, line 59, contacts ZY and 2X of relay R2,`lineil, contacts 3Y and 3X of relay 7 line H6, line 13,'1ine`14 and` generator 51 to ground.` The energizing of the operating coil of relay CSI opens the circuitV for the'operating coil of relay CS2 at armature |08 and contact |99. The cle-energizing of the operating coil of relay CS2 opens the holding circuit of the coil 3.9 at'armature H3 and contact H2. Since the contacts c-d of` the set of contacts Cl had already been opened by the arm 22 passing them the coil 39 is de-energized and the spring 31 draws the slide 35 and v,n and out contacts 33 and 34 to the right, closing the in Contact 33 with contact 32.` The circuit through the operating coil Vof relay RS is therefore reestablished. Since an operating coil of relay TS is also connectedy across lines 56 and 19 the circuit of the operating coil RE will be broken at armature 9| and ,contact 92V. The tracer disc will therefore move south until contacts 32-33 are opened by the lever 29 being tilted whereupon the east motion will take over due to the closing of the circuit of the operating 4coil ofrelayREconsequent upon the deenergizing orv the `operating `coil TS. Southerly and easterly movements will therefore be successively imparted to the tracer disc I3 about the template rst resulting in the openingof the contacts 24 whichwill have no result (since the circuits for the operating coil of CS2 and of the magnetlSe l,are open at H2 and c-vl) and then resulting in the closing of the contacts a-b-c--d ofthe set or contacts C2 by the arm 22 when the disc reaches the northeasterly position on the periphery of the template.- y y i The closing of the set of contacts C2 has the following results. The closing of the contacts c-v-d of, said setyenergizes the magnet 3 9 through the same circuit as that controlled by the contacts c-cl.of CI and also in the same manner energizes the operating coil of -relay CS2 establishing holding circuits both for said coil and for the magnet 39 through .the armature H3. The slide `35 with the fin and out contacts 33 and 34 is thus moved to the left.

The closing` of contactsv b-c-d energizes the coil 4H4 of relay R2 through the circuit from ground, contacts d-c-b of C2, line I I5, junction point |I6, line H1', junction point H8, coil H4 of relay R2, junction point H9, line 56 and generator 51 to ground.A n i The closing of contacts a-b-c-d of this series de-energizes the operating coil 50 of the relay RI by energizing the operating coil R5 through the' circuit fromground, contacts d-c-b-a, line |65, line 69, armature 1U, contact 1|, line 12 operating coil of relay R5, line' 13, line 14 and generator 51-to ground. The contacts of relay RI immediately open and the de-energizing `of the operating coil R5 by the energizing of operating coil R in the manner hereinbefore'described cannot reestablish the circuiteof coil 50 since such circuit is` broken at contacts If and IX of relay RI.` The de-energizing of operating coil R5 does, however, establish a holding circuit of `the operating coil H4 of relayfR2 from junction point H8 through line |20, contacts 2f and 2X, line 6U contactsSX and 3Y, line 6I, contactsX and 4Yline 62, contact B3, armature 64 andline65 .to ground such circuitparalleling that through theecontacts a-b-c--d of C2.

The energizing of operating coil H4 of relay R2 closes the contacts 2W-2E-2S and 2X respectively against contacts 2o-.2d2e and 2f, thereby in addition .to establishing -the aforesaid holding circuit, connects the operating coils of relays RW- and RE respectivelyjto inf and out contacts 33 and 34 'of the tracer slide 35i-in place I! of the operating coils'RS and RN which were con-fA nected to said contacts when the relayRI was operated. Also the operating coilRSfreplaces the operating coil RE in being connected to the,v contact 92 which cooperates with the armature;

9| 0f the relay TS. i

If the tracer lever'29 is in neutral position the j, coil TS will be de-energized and the operating; coil, RS will 'be energized resulting in a southerly movement of the tracer disc I3 until Athe tracer,- lever 29is tilted to close contact 32 and o\,lt, co,n-. y tact 34 resulting in the `energizing cir an operatingV coil of relay TS and also the energizationof oper--` ating coil of relay RE, thus producing an easterly;

movement of the tracer disc. The tracerAv disc coil of relay CS2 being closed.

When the tracer disc I3 reaches the eastposition the contacts 25 will close which will have the same effect as the closing of contacts`f24,` namely, the energizing of the operating coil of?, relay CSI and the consequent opening of the holding circuits of magnet 39 and of the operating coilof relay CS2. A be de-energized and the spring 31 willmove the slide 35 and in and out contacts 33"a1id'34` carried there-by to the right. Due to this movement of the slide the relays RWand RS will alternately be operative, thus moving the tracerdisc I3 ina southwesterly direction about the tem"l plate. the machine when No change will occur in the operation'of the contacts 25 are opened for the reasons given with respect to the openingy of the contacts 24. When they tracer disc I3 reaches its southwesterly position on holding circuit will be completed for coil |20 through armature 64 of -relay R5. Due tothe` operation of relay R3 the operating coils of relays RN and RS will be respectively connected to the 4 in and out contacts 33 andv 34 of the tracerv slide 35 while the operating coil offrelay. RW.

will be connected to the contact 92 of the relay"` TS. Also the magnet 39 will be energized and a holding circuit completed therefor 'through armature H3. i

Due to the slide 35 being in its tion, the operating coil ofl relay RW will be operative when the tracer lever 29 is in its neutral position and operating coil of relay RS will be operative when the tracer lever 29 is tilted from x its neutral position Aby engagement with the template. Consequently the tracer disc I3 will-movel about the template I4 in a southwesterly direction. When the contacts C3 open no change will take place in the operation of the machine and the tracer disc will continue `itsmovement until it reaches its south position whereupon .con-f.

tacts 2E will be closed. The closing of these contacts acts in the same way as the closing of the contacts 24r or the closing of the contacts -25 and the magnet 39 is deenergized. whereby the slide 35 and the in and out contacts.. 33 and 341.

The magnet 39 will therefore@l the template I4 the contacts C3 will be closed resulting inthe de-energizing of the operating coil H4 of. the relay R2 and the energizing of the operating coil- I2Il of the relay R3 in the same manner as described with respect to the change over from RI f to R2 upon the closing of the contacts C2 and/a;

left-hand posiannessa'- I 19T anemoyed to the right by the springf .'3'1.v v*Due-*tovv thstmovement, the operating coils' of rela'ys'RW- andi are alternately energized depending upon whether the'tracer vlever :Z9 isin neutralor tilted position. The tracer disc i3 vwill therefore move around .the template fill in a northWesterly direc- When the .contacts 26 are opened no change will .take yplace in the operation ofthe machine. When the tracer disc i3 vreaches the .southwest position the .contacts Cd will 'be `closedlby the arm 22 resulting in the .change .over frornfrelayl R3 to the relay Re and the energizing-of :the magnet .39. Due to this change over the operating coils :of the relays RE andltW Will ."tieirespec-` tively .connected to the in and o-utf'contacts E 3-3 .and i313 of the tracer slide 35 and the operating coil RN Will be connected tothe contact. y92 of the relay TS. Due to the slide'.35 having-'been moved to .the left by the energizing of magnet 39"the operating coils of the relays RW and fRN'' Will be alternately operative and the tracer `disci |31.will continue its movement about Vthe template in -a northwesterly direction. No change Y.willwtake place-fin the operation of the machine when'the contacts C4 are opened andl When the :tracerv disc reaches its West position on the template :the contacts 23 will be closed by the arm"22.

"The Aclosing of contacts 23- will, as :described with reference to the closing ofA contacts 24,1.deenergize maghetto permittingsprin'gl to move thesli'de `3'5 and the"in .and out contacted-i3 arnd 34' to the right whereby the tracer lever"29 vvilly alternately/cause the energization of:1 the opyera'ting coils of the relays RE' and RNLcauSing the tracer disc I3 to move around the .template in -a northeasterly direction until the tracer disc lreaches the positionvwhere it rst contacted the template l2 completing the operation of the machine. In the above described operationg-of the-machine only the operation 4 of push button I has been referred to. If the vtracerdisc is in position :for rst contacting .theitemplate `.in-the northeast sector the push button 2v would rheinitiallycperated resulting in the operation of,-re1ay R2 whereupon the .relays R3, R4 'and Rl would operate .in -succession to .completethe movement of the tracer vabout .the template."

the tracer -disc is in -positionffor irstvv conltaoting'lthetemplate in the-southeast or the south- West sectorsw'the push buttons 'l-and 4 Would-'be respectively operated Whereupon'the relaylRilfor R4 Would be operatedffandlsthefftragcer disc then moved around the template operation of the other relaysf A A,

V The ahorre" des`cription".has been basel n the assumption 'that the "template 'M' Was acircleor generally circular in outline. In Fig. 7 is shown an irregular template lila in which reversals of movement of the tracer disc i3 are required lduring its movement about the outline being reproduced. In operating on tem-plates ofthis type requiring reversals of movement at various and differently spaced positions it is necessary to mount the series of groups of contacts Cl, C2, C3 and C4 and the intermediate contacts 23,` 2d, 25 and 26 in their. ring 21 at the various points Where reversals of movement are required.

As stated previously theinvention is adapted for application to the duplicating machine disclosed in patent to J. C. Shaw, 1,683,581. Fig. 8 shows an outline of this machine having the -present tracer construction shown in operative position relative to the principal part of the machine.

.by the successive l' 'I'he`ttracer :10 and its .associated parts Lare .car-

ried byfabracket relative to-Which the tracer may loe-vertically adjusted and Xed :in-position during operation. Bracket .|25xis secured .tothe cutter head 1'26 vertically movable on .the column \|;2'l\vvh=ich is provided With the A,usual .vertical Ways f or ythatpurposezi Column'lzl is movable laterallyfin-z'a horizontal direction on a bas-e 28. Adinstmentv ofthe cutter head with: the tracer toward'lfand from thertem-plate I fi and work piece il` isrzprovided by 'horizontal ways on the column l 21:13 ."Byfmovement. up and rdovvnof the .cutter head-'TMS on the .column 121 and horizontal transvers movements ofthe column l2? on the base iz'fthe tracer-wand vcutter .9 may vbe made to .traverseanyioutline .as called for by the template.

At allltimes during' the cutting operation vthe templatefland'work piece .are held in Xed position in the same manner as in :the above refer-red t0 ptent' Y y l l WhatI claim is: v 1. A itracer for -electrically controlled duplicating -mac'hines comprising in combination, a tracer body,` a tracerarm therein one end :of which is adaptedto'engage the periphery of a template and thelo-pposite ends/aries ythe position of a contact carrying lever' when the'tracer arm .is `'acm-'- ated in '-l'any'y direction, a member fmountedfadjacent saidv lever having opposed contacts thereon suitably spaced #apart andv engageable respectively yWith the contacts Von 'saidv lever, and means cont-rolled by movement of 'said tracer abouty the template to-move said memberfa--limited distance inadirection toopenf'one of its contacts and' close Lthe f' other contact With-the contacts'cn said lever. L12?.' A tracer'for electrically controlled duplicating friaclines'.-comprising in combination, a tracer bodyfa tracer arm lthereinone end of Ivvhig'zhi's edapted'toengage the periphery" of a template and/theopposite end-varies the position of a contacto'arrying lever when Athe tracer arm is lactu-- ated infany direction, a member'mounted'adfjacent' said ile'verv having' opposed contacts thereon engageablefrespectively' with Ithe contacts onsaid lever., jmeans normally 'holding said member in onepositiomand means to move v-saidinemberr 'a limited'distanceperiodically during operation of the machine :to vary ,the positions of the contacts carried therebyrelativeto said lever.

L3. A tracer for .electrically controlled duplicatchinelscomprisingin combination', a tracer been adapted .to/ engage the periphery .of a template andftn' -opposite/rend ,varies .the position effe Cpntac nngTIeVenWhemthe ,tracer .arm Lis' actuated 1n any direction, a member mounted adjacent said lever having opposed contacts thereon engageable respectively with the contacts on said lever, spring means normally holding said member in one position, and electromagnetic means to move said member a limited distance during operation of the machine to vary the positions of the contacts carried thereby relative to said lever.`

4. A tracer for electrically controlled duplicating machines comprising in combination, a tracer body, a tracer arm therein one end of which is adapted to engage the periphery of a template and the opposite end varies the position of a contact carrying lever when the tracer arm is actuated in any direction, a member mounted adjacent said lever having opposed contacts thereon adjustable toward and from each other and engageable respectively with the contacts on said 11 lever, and means to move said `member predetermined adjustable distances during the operation of the machine to vary positions of the contacts carried thereby relative toesaid lever.

5. A tracer for electrically controlled duplieating machines comprising in combination; a tracer body, a tracerarm therein one end of which is adapted to engage the periphery of a template and the opposite end varies the position of a contact carrying, lever when the tracer arm is actuated in any direction, a -member mounted adjacent said lever having opposed con'. tacts `thereon engageableV respectively with thev contacts on said lever, means normallyiholding said member in one position, and electromagnetic means to move said slidable member a predetermined adjustable distance during operation of the machine to vary positions of the contacts carried thereby relative to said lever.

6. A tracer for electrically controlled duplicating machines comprising in combination, a tracer body, a tracer armtherein one end of which is adaptedto engage the lperiphery of a template and the opposite end opens and closes contacts when the tracer arm is actuated in any direction, an arm rotatably mounted on said tracer body engaging a member `positioned on said template, a gear mounted for rotary movement with said arm as said tracer traverses said template, a contact closing member actuated by said rotatable gear and arm, aplurality of contacts adjustably vmounted on said tracer body adjacent said contact closing member adapted to be successively operated by said contact closing member, and machine controlling circuits opened and closed thereby. y

7. A tracer for electrically controlled duplieating machines comprising in combination, a tracer body, a tracer arm therein one end-of which is adaptedv to engage the periphery of a template and the opposite end opens and closes contacts on said tracer body when the tracer arm is actuated in any direction, aradial arm mounted on said tracer body and rotatable about an axis parallel With said tracer body Aas the tracer traverses the template, said radial arm pivotally engaging a member positioned within said template, a contact closing member actuated by said radial arm, and a plurality of adjustably positioned contacts mounted on said tracer body adjacent said contact closing member adapted .to be successively operated thereby, and machine controlling circuits opened and closed thereby.

8. A tracer for electrically controlled, duplicating machines comprising in combination, a tracer body, a tracerarm therein one end of which is adapted to engage` the periphery of ya Number template and the opposite end opens .and closes contacts when the tracer arm is actuated in any direction, an arm rotatably mounted on said tracer body and pivotally engaging a member outstanding from a point Within the periphery of said template, a gear mounted for movement with said arm as said tracer traverses said template, a contact closing member rotated by said rotatable gear and arm as said tracer traverses the periphery of said template, a plurality of contacts mounted on said tracer body adjacent saidcontact closing member in a circular series concentric with the axis of rotation of said contact closing arm, said contacts adapted to be successively operated by said closing member, and machine controlling circuits opened and closed thereby.

9. A tracer for electrically controlled dupli.V eating machines comprising inl combination, a tracer body, a tracer arm therein one end of which is adapted to engage the periphery ofl a template and the opposite end opens and closes contacts when the tracer arm is actuated in anyl direction, a radial arm mounted on said tracer body; said arm being rotatable about an aXis parallel with said tracer body and pivotally engaging a member positioned within said template as s'aid tracer traverses said template, a contact closing member actuated by said rotatable arm, and aplurality of adjustable series of contacts mounted on s'aidtracer body adjacent said contact closer adapted to be successively operated by lsaid closer, and circuits opened and closed by said contacts to traverse said tracer about said template.

ROBERT D. SHAW.

REFERENCES CITED The following references are of recordin the iile of this patent:

- UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Jan. 13, 1937 Number Great Britain May 11, 1939 

